My Fi has a cousin who has been arrested for assault and drug use, has ruined a few family gathering by being high and picking fights, and he is overly aggressive. I've only met him once but these are all things I've heard about him, but I'm torn on whether or not to invite him. It would not even be a question if he weren't family. I think family is important on one hand but I also do NOT want someone at my wedding who may be high off of his mind and/or get into a physical fight. My FMIL as well as my FSIL have both told me that he should not be invited because of these behavoral problems.
Initially my Fi and I made up our minds that we didn't want him there and we told my FMIL to inform her brother that his son (Fi's cousin) wasn't invited before invites went out so that there wasn't confusion as to why he wasn't on the invite. Apparently, she is overly worried about her brother being offended (which I understand he may rightfully be) because he backs up his son no matter how bad his behavior is. So my FMIL and FFIL decided that they would hold off on telling him and wait for my Fi's cousin to get arrested so they don't have to break the news that he's not invited.
I'm torn on what to do. I don't want to force my FMIL into a sticky situation with her brother. I don't want someone who will likely get into a fight at my wedding. I don't want to start off joining my Fi's family by excluding family members.